Corrosion resistant tubular article



Patented Oct. 18, 1938 UNITED STATES I 2,133,847 r l CORROSION RESISTANTTUBULAR ARTICLE Donald K. Crampton,

Marion, and Newell W.

Mitchell, Waterbury, Conn., assignors to Chase Brass & Copper 00.,Incorporated, Waterbury, Conn., a corporation of Connecticut No Drawing.Application March 30, 1936,

Serial No. 71,808 I 6 Claims.

This invention relates to improvements in corrosion-resistant tubulararticles, and more particularly, corrosive-resistant wrought-metaltubular articles formed of copper-base alloys containing phosphorus,aluminum, zinc and tin, with or without other elements which do notseriously impair the properties of the alloy.

We have found that wrought-metal tubular articles, such, for example, astubes, pipes, etc., made of copper-base alloys containing phophorus fromabout 4% to about 2%, aluminum from about 4% to about 4%, zinc fromabout 1% to about 30%, tin from about A,% to about 3 and copper, thecopper, phosphorus, aluminum, zinc and tin constituting about 90% ormore of the alloy, with or without one or more additional elements insuch substantially-innocuous amounts as do not seriously impair theproperties of the alloy, have valuable corrosion- 20 resistantproperties, especially when in contact with saline liquid or diluteacid. The additional elements may range up to a total of about dependingon what elements are added, some being more innocuous than others.

While each of the elements iron, antimony and arsenic should not bepresent much in excess of about 0.1%, silver, which is comparativelyinnocuous may be present to as high as about 10% provided not too muchof other elements is present. Nickel may be present to as high as about5%, lead may be present to as high as about 3 5%, silicon may be presentto as high as about 3%, and manganese may be present to as high as about1%.

The phosphorus may range from about A;% to about 2%, the aluminum fromabout to about 4%, the zinc from about 1% to about 30% and the tin fromabout to about 3 /2%, andthe zinc preferably should be in such quantity,not more than about 30%, as to have the alloy consist entirely of thealpha phase, with the sum of the phosphorus, aluminum and tin contents 6or less for zinc contents of or more and '7 or less for zinc contents ofless than 20%.

It is still more preferable to have the phosphorus from about to about 1/2%, the aluminum from about 1% to about 3%, the zinc from about 5% toabout 20%, and the tin from about 1% to about 3%, and preferably the sumof the phosphorus, aluminum and tin contents should be 6 or less.

It is even more preferable to have the phosphorus from about /2% toabout 1%. the aluminum from about 1% to about 2%, the zinc from about 5%to about 15%, and the tin from about 1%- to about 3%. And within thisrange three alloys may be advantageously made having nominal compositionas follows: all three have about 1 5% aluminum and about 10% zinc, thefirst having about 1% phosphorus and about 3% tin, the second havingabout phosphorus and about 2% tin, and the third having about 7phosphorus and about 2 tin.

The invention may be carried out in other specific ways than thoseherein set forth without departing from the spirit and essentialcharacter istics of the invention, and the present embodiments aretherefore to be considered in all respects as illustrative and notrestrictive, and all changes coming within the meaning and equivalencyrange of the appended claims are intended to be embraced therein.

We claim:

1. A wrought-metal tubular article for use in contact with saline liquidor dilute acid and characterized by good corrosion resistance to salineliquid and dilute acid and formed from an alloy containing: phosphorousas an essential element from about to about 2%; aluminum from about /4.%to about 4%; zinc from about 1% to about 30% and in such quantity as tohave the alloy consis't entirely of the alpha phase with the sum of thephosphorus, aluminum and tin 6 or less when the zinc is 20% or more, and7 or less when the zinc is less than 20%; tin from about /2% to about 3and the balance substantially of copper.

2. A wrought-metal tubular article for use in contact with saline liquidor dilute acid and characterized by good corrosion resistance to salineliquid and dilute acid and formed from an alloy containing: phosphorusas an essential element from about 2% to about 1 aluminum from about 1%to about 3%; zinc from about 5% to about 20%; tin from about 1%v toabout 3%; and the balance substantially of copper.

3. A wrought-metal tubular article for use in contact with saline liquidor dilute acid and characterized by good corrosion resistance to salinephosphorus as an essential element about 1%; aluminum about 1 /2%; zincabout 10%; tin about 3%; and the balance substantially of copper.

5. A wrought-metal tubular article for use in contact with saline liquidor dilute acid and characterized by good corrosion resistance to salineliquid and dilute acid and formed from an alloy containing: phosphorusas an essential element about 4%; aluminum about 1 /2%; zinc about 10%;tin about 2%; and the balance substantially of copper.

6. A wrought-metal tubular article for use in contact with saline liquidor dilute acid and characterized by good corrosion resistance to salineliquid and dilute acid and formed from an alloy containing: phosphorusas an essential element about /2%; aluminum about 1 zinc about 10%; tinabout 2 /2%; and the balance substantially of copper.

DONALD K. CRAMPTON. NEWELL W. MITCHELL.

